Nothing in the natural world makes sense - except when seen in the light of evolution

No one will protect what they don't care about, and no one will care about what they have never experienced.

The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.

Instead of controlling the environment for the benefit of the population, perhaps we should control the population to ensure the survival of our environment

What humans do over the next 50 years will determine the fate of all life on the planet.

Anyone who believes in indefinite growth on a physically finite planet is either mad or an economist

The World is full of wonders, but they become more Wonderful, not less Wonderful when Science looks at them.

The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.

Bringing nature into the classroom can kindle a fascination and passion for the diversity of life on earth and can motivate a sense of responsibility to safeguard it.

I just wish the world was twice as big and half of it was still unexplored.

The tyrant has power to play as long as he is the master in his surroundings.

If it took your authentic voice to get you there, it will take your authentic voice to keep you there. Your job is to keep listening.

Ah take the cash and let the credit go.

We cannot both preach and administer financial matters.

There's no getting away from it: you have to clean.

Everything has a nothingness. On the other side of physical reality, there is another world, and in that world, everything is something else.

I could do terrible things to people who dump unwanted animals by the roadside.

God never sends the mouth but he sendeth meat.

I think the major problem in growing up is to become sophisticated without becoming cynical.

But what I really am interested in is not the end of the world but everything which precedes it.